Add Get Word Count For All Files In Git Repo as a Unix TIL

unix/get-word-count-for-all-files-in-git-repo.md

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+# Get Word Count For All Files In Git Repo
+
+As part of gathering numbers for [A Decade of TILs](), I wanted to get an word
+count of all the TIL markdown files I've committed to this project over its 10
+year history. By using `git ls-files` with a pattern, I can get a list of all
+file names. Then with `xargs` I can pass that entire list to `wc -w` which
+gives a word count of each. The final line that `wc -w` outputs is a sum total
+of all the file word counts. Lastly, piping that through `tail -n1` gives me
+just that last total count line.
+
+```bash
+$ git ls-files "*/**.md" | xargs wc -w | tail -n1
+  206816 total
+```
+
+Since the `tail -n1` obfuscates what the `wc -w` is doing, here is what that
+looks like before that final pipe.
+
+```bash
+$ git ls-files "*/**.md" | tail -n3 | xargs wc -w
+     115 zsh/add-to-the-path-via-path-array.md
+     190 zsh/link-a-scalar-to-an-array.md
+     214 zsh/use-a-space-to-exclude-command-from-history.md
+     519 total
+```
+
+I can even clean up the final output a bit more with `awk`:
+
+```bash
+$ git ls-files "*/**.md" | xargs wc -w | tail -n1 | awk '{print $1}'
+206816
+```